(a) In the figure the battery has an emf of 10 V and an internal resistance of 4.3 Q. What is the value of the resistance R for which the rate of energy dissipation is maximum? (b) Calculate this maximum rate. WWH Real battery (a) Number i (b) Number i Units Units
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- The time needed for fully charging of the capacitor is 50ms for an RC charging circuit. If the capacitance value is 17 µF. Find the resistance value in ohm?The internal resistance of the DMM is 10 M when used as a voltmeter. Calculate Req of the voltmeter connected to a resistor in the circuit.In an automobile, the system voltage varies from about12 V when the car is off to about 13.8 V when the car is onand the charging system is in operation, a difference of15%. By what percentage does the power delivered to theheadlights vary as the voltage changes from 12 V to 13.8 V?Assume the headlight resistance remains constant.
- A resistor with an unknown resistance is connected in parallel to a 13 Ω resistor. Whenboth resistors are connected in parallel to anemf source of 20 V, the current through the unknown resistor is measured with an ammeter to be 4 A.What is the resistance of the unknown resistor?Answer in units of Ω.A resistor with an unknown resistance is connected in parallel to an 11 Ω resistor. Whenboth resistors are connected in parallel to anemf source of 17 V, the current through theunknown resistor is measured with an ammeter to be 4 A.What is the resistance of the unknown resistor? Answer in units of Ω.The RC charging circuit in a camera flash unit has a voltage source of 265 V and a capacitance of 111 µF. HINT (a) Find its resistance R (in ohms) if the capacitor charges to 90.0% of its final value in 16.7 s. (b) Find the average current (in A) delivered to the flash bulb if the capacitor discharges 90.0% of its full charge in 1.54 ms. A
- For the circuit shown in Fig. both volt meter and ammeter are idealized, the battery has no appreciable intemal resistance, and the ammeter reads 5 A. (a) What does the voltmeter V read? (b) What is the total current I of the circuit? (b) What is the total voltage Vof the battery? (c) What is the total resistance R of the circuit? 25.0 N A 15.0N V 45.00 15.0N 10.0 It 35.0 V = ? %3DFor the circuit shown in Fig. both volt meter and ammeter are idealized, the battery has no appreciable internal resistance, and the ammeter reads 5 A. (a) What does the voltmeter V read? (b) What is the total current I of the circuit? (b) What is the total voltage Vofthe battery? (c) What is the total resistance R of the circuit? 25.0 0 V ww A 15.00 45.00 15.0 0 10.0 N +1 35.0Q V = ?A storage battery has an emf of 6.7 V and internal resistance of 0.50. Compute for the terminal voltage of the battery when it is being charged with 2.0 A.
- In the figure a voltmeter of resistance Ry R in a circuit that also contains Ro potential across R and i is the ammeter reading. The voltmeter reading is V, which is V plus the potential difference across the ammeter. Thus, the ratio of the two meter readings is not R but only an apparent resistance R' = V'/i. If R = 111 S, what are (a) the ammeter reading in milliamperes, (b) the voltmeter reading, and (c) R'? = 391 N and an ammeter of resistance RA = 1.56 N are being used to measure a resistance = 100 N and an ideal battery of emf ɛ = 12.0 V. Resistance R is given by V/i, where V is the R R, (a) Number Units (b) Number Units (c) Number UnitsA resistor with an unknown resistance is connected in parallel to a 17 Ω resistor. Whenboth resistors are connected in parallel to anemf source of 13 V, the current through theunknown resistor is measured with an ammeter to be 2 A.What is the resistance of the unknown resistor?)) Thermistors are used to measure the temperature of bodies. Thermistors are based on materials' change in resistance with temperature. To measure temperature, manufacturers provide you with a temperature vs. resistance calibration curve. If you measure resistance, you can find the temperature. A manufacturer of thermistors makes several observations with a thermistor, which are given in Table. Determine the temperature corresponding to 702.8 ohms using Lagrange polynomial interpolation. Show your calculations clearly. Temperature vs. Resistance 55 50 R (ohm) T (C) 45 40 1101.0 25.113 30.131 40.120 911.3 35 636.0 30 451.1 50.128 25 20 400 500 600 700 Resistance (ohms) 900 1000 1 100 1200 800 Temperature (°C)